Advertisement

New Type of Organic Alloys: Modification of Phase Transition of (NPPy)(TCNQ)n

  • M. Murakami
  • S. Yoshimura
Part of the Nato Conference Series book series (NATOCS, volume 1)

Abstract

A wide range of electrical, magnetic and structural properties of the organic conductors based on 7,7,8,8,-tetracyanoquinodimethane, TCNQ, have been observed, and these have set up active arguments on their origin and how the physical properties can be designed. (1). We have suggested that substituted pyridinium and thiazolium salts of TCNQ form a unique class of materials serving as a good tool for studying the solid state chemical properties of organic conductors (2,3). In particular, N-n-propylpyridinium(TCNQ)n ((NPPY)(TCNQ)n or A) shows a reversible first-order phase transition at 108°C accompamied with a sudden change in resistivity by a factor upto 20 (2). The high temperature phase is featured by both temperature-independent resistivity of 2 Ωcm and magnetic susceptibility of 6.6 × 10-4 emu/mol. The crystal structure change is supposed to dominate the phase transition, because its nature can be varied strikingly by modifying the structure of the cation molecule. Moreover, the reversible transition is found only for salts having specific cations; e.g., N-n-butylpyridinium(TCNQ)n ((NBPy)(TCNQ)n or B), N-n-propylthiazolium(TCNQ)n ((NPTh)(TCNQ)n or C) and N-n-butyl-thiazolium(TCNQ)n ((NBTh)(TCNQ)n or D) (2,3).

Keywords

Phase Transition High Temperature Phase Domain Wall Motion Active Argument Organic Conductor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1. (a)
    J. H. Perlstein, Angew. Chem. 16, 519 (1977);CrossRefGoogle Scholar
  2. 1. (b)
    J. J. Torrance, to be published in Annal N.Y.A.S. (1978);Google Scholar
  3. 1. (c)
    J. s. Miller, to be published in Annal N.Y.A.S. (1978).Google Scholar
  4. 2. (a)
    M. Murakami and S. Yoshimura, Abstr. 7th Mol. Cryst. Symp. Nikko, Japan, Sept. 8 – 12, 1975, p.193;Google Scholar
  5. 2. (b)
    M. Murakami and S. Yoshimura, Chem. Lett., 929 (1977).Google Scholar
  6. 3.
    S. Yoshimura and M. Murakami, to be published in Annal N.Y.A.S. (1978);Google Scholar
  7. 3a.
    M. Murakami and S. Yoshimura, to be published.Google Scholar
  8. 4.
    W. A. Barlow, G. R. Davis, E. P. Goodings, R. C. Hand, G. Owen, and M. Rhodes, Mol. Cryst. Liq. Cryst. 33, 132 (1976).CrossRefGoogle Scholar
  9. 5.
    M. Murakami and S. Yoshimura, J. Phys. Soc. Japan 38, 488 (1975).CrossRefGoogle Scholar
  10. 6.
    V. Raghavan and M. Cohen, in Treatise on Solid State Chemistry, vol 5, ed. N.B. Hannay (Plenum Press, N.Y. 1975) p. 67.Google Scholar

Copyright information

© Plenem Press New York 1979

Authors and Affiliations

  • M. Murakami
    • 1
  • S. Yoshimura
    • 1
  1. 1.Matsushita Research Institute Tokyo, Inc.Ikuta, Tama-ku, Kawasaki 214Japan

Personalised recommendations